Chuck-jaw.



No. 729,727. V Patented June 2, 1903.

Nl-TED STATES PATENT OFFICE.

EDWARD P. B-ULLARD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BULLARDMACHINE .TOOL COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OFCONNECTICUT.

CHUCK-JAW.

SPECIFICATIONfonning part of Letters Patent No. 729,727, dated June 2,1903.

7 Application filed December 9, 1902} Serial No. 134,531. (No model.)

To all whom it maycoltcern: found on various kinds of machine tools,

Be it known that I, EDWARD P. BULLARD, particularly drills, lathes,boring-mills,&c. a citizen of the United States, and a resident Thistable, as is usual, is provided with a of Bridgeport, in the county ofFairfield and series of radially arranged grooves 13, in

State of Connecticut, have invented certain which various forms of toolsare designed to 55 new and useful Improvements in Chuckbe secured, andare especially adapted for Jaws, of which the followingisaspecification. gripping-jaws such as my invention com- This inventionrelates tonewand useful irnprises. The majority of clamping-jaws ofprovements in chuck-jaws such as are extenthis class now found upon themarket are pro- 1o sively used on drills, lathes, boring-mills, &c.vided with a screw which sets out from the 60 It is the object of myinvention to improve rear end in a manner to operate the jaw as uponjaws of the above class in several imdesired. This form of device isobjectionportant particulars, the first of which is to able for tworeasons, one being the fact that provide a jaw which will grip and holdan itnecessarily sets up high above the table article firmer than thosenow in use; second, and likewise projects out far from the outer 65 toconstruct said jaw in a way that the entire end, thus beingobjectionable, for the reason load will not come entirely against theclampthat'it is very much in the way. Further, ing-screw, but may bedeflected against the such a construction is weak and quickly gives waysin which the jaw is mounted; third, to way under the severe usage thatit gets.

so arrange the device that the adjusting My invention may be attached toany of 70 screw will not set up against thejaw and prothe usual forms ofmachine-tables and reject therefrom, but will be arranged to one quiresno special construction other than that side below the plane of the jawand at an usually found. It comprises an attachable angle thereto otherthan a right angle to the portable base C to fit upon the face of malineof movement of the jaw, thus making chine-tables and is provided withone or more 75 the article more compact and requiring less ways D toengage the beforementioned space upon the table, all of which are verygrooves B of said table. This base is proimportant features. vided withbolts F for its attachment to the With the above objects in view myinventable, which bolts pass through the holes E 0 tion resides andconsists in the novel conof said bed and engage the shoulders ofythe 8ostruction and arrangement of parts shown grooves B in the usual way.This base is upon the accompanying sheet of drawings, -further providedwith a way G, having lonforming a part of this specification, upongitudinal ribs H in its side walls, the whole which similar letters ofreference denote like adapted to receive the jaw I, which is sur- 5 orcorresponding parts throughout the sevfacedto fit said ways and ribs inamanner 8 eral figures, and of which-- to allowthejaw to slidelongitudinally there- Figure 1 shows a perspective view of a borin, butat the same time retain it in engageing-mill table detached with aseries of four of ment with the adj ustingscre w, as will latermyimproved clamping-jaws attached thereto be explained. The jaw propercontains the 40 and ready for use. Fig. 2 is a plan view of usualgripping-surfaces J and is further pro- 90 my improved clamping-jawdetached. Fig. vided with a diagonally-arranged toothed 3 is alongitudinal vertical section taken on bottom surface K, as will be seenin dotted line 3 3 of Fig. 2 and is designed to illuslines in Fig. 2. Ata right angle to the face trate the connection between the screw and ofthese teeth and diagonally through the jaw. Fig. 4 is an end view asseen from the lower portion of the base is arranged a bore 5 left ofFig.2.. Fig. dis a similar-end view of L, the ends of which are inclosed bycaps M,

a smaller or single-way jaw. the latter also forming a bearing for adiago- Referring in detail to the reference charnally-arrangedadjusting-screwN,the threads acters marked upon the drawings, A repreofwhich engage the toothed rack on the unsents a rotary table, such as iscommonly der side of the jaw in a manner to operate roe of the screw,the operating ends of the latter are brought to one side of the base andcan be more conveniently operated from either end, and by reason of thescrew being located beneath the jaw said ends are likewise brought downclose to the face of the table, so that it is practically out of theway, yet convenient for operating. Owing to the great number of threadsin the screw and teeth in the jaw for engaging the screw, a very strongand reliable engagement is had between the parts, thus being equal toany-strain that is brought to bear.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. Inadevice of the class described,thecombination'Wit-h a portable basehaving means of attachment to a table, of a jaw mounted therein andcontaining diagonal teeth on its under side,- a bore arranged diagonallywith reference to the line of movement of jaw through the base, anadjusting-screw mounted in said bore in engagement with the teeth of thejaw for operating the latter, said screw extending through the base withexposed engaging heads on either end.

2. Inadeviceoftheclassdescribed,thecombination with a portable base, ofmeans for its attachment to a machine, a jaw mounted in said basebearing teeth on its under side, a bore through the base, bearing-capsinclosing either end of said bore, a screw mounted in said bearing-capsto engage the jaw, and heads on either end of the screw for adjustingthe same.

Signed at Bridgeport, in the county of Fairfield and State ofConnecticut, this 1st day of December, A. D. 1902.

EDWARD l. BULLARD.

Witnesses:

J. D. McLEoD, R. IRWIN SMITH.

